cmds/statsd/src/stats_events.proto

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto2";

// TODO: Not the right package and class name
package android.os.statsd;
option java_package = "com.android.os";
option java_outer_classname = "StatsEventProto";

/**
 * The master event class. This message defines all of the available
 * raw stats log events from the Android system, also known as "atoms."
 *
 * This field contains a single oneof with all of the available messages.
 * The stats-log-api-gen tool runs as part of the Android build and
 * generates the android.util.StatsLog class, which contains the constants
 * and methods that Android uses to log.
 *
 * This StatsEvent class is not actually built into the Android system.
 * Instead, statsd on Android constructs these messages synthetically,
 * in the format defined here and in stats_log.proto.
 */
message StatsEvent {
    // Pushed events start at 2.
    oneof pushed {
        // For StatsLog reasons, 1 is illegal and will not work. Must start at 2.
        BleScanStateChanged ble_scan_state_changed = 2;
        BleUnoptimizedScanStateChanged ble_unoptimized_scan_state_changed = 3;
        BleScanResultReceived ble_scan_result_received = 4;
        SensorStateChanged sensor_state_changed = 5;
        GpsScanStateChanged gps_scan_state_changed = 6; // TODO: untested
        SyncStateChanged sync_state_changed = 7;
        ScheduledJobStateChanged scheduled_job_state_changed = 8;
        ScreenBrightnessChanged screen_brightness_changed = 9;
        // 10-20 are temporarily reserved for wakelocks etc.
        WakelockStateChanged wakelock_state_changed = 10;
        UidWakelockStateChanged uid_wakelock_state_changed = 11;
        LongPartialWakelockStateChanged long_partial_wakelock_state_changed = 12;
        BatterySaverModeStateChanged battery_saver_mode_state_changed = 21;
        DeviceIdleModeStateChanged device_idle_mode_state_changed = 22;
        AudioStateChanged audio_state_changed = 23;
        MediaCodecActivityChanged media_codec_activity_changed = 24;
        CameraStateChanged camera_state_changed = 25;
        FlashlightStateChanged flashlight_state_changed = 26;
        UidProcessStateChanged uid_process_state_changed = 27;
        ProcessLifeCycleStateChanged process_life_cycle_state_changed = 28;
        ScreenStateChanged screen_state_changed = 29;
        BatteryLevelChanged battery_level_changed = 30;
        ChargingStateChanged charging_state_changed = 31;
        PluggedStateChanged plugged_state_changed = 32;
        DeviceTemperatureReported device_temperature_reported = 33;
        DeviceOnStatusChanged device_on_status_changed = 34;
        WakeupAlarmOccurred wakeup_alarm_occurred = 35;
        KernelWakeupReported kernel_wakeup_reported = 36;
        WifiLockStateChanged wifi_lock_state_changed = 37;
        WifiSignalStrengthChanged wifi_signal_strength_changed = 38;
        WifiScanStateChanged wifi_scan_state_changed = 39;
        PhoneSignalStrengthChanged phone_signal_strength_changed = 40;
        SettingChanged setting_changed = 41;
        ActivityForegroundStateChanged activity_foreground_state_changed = 42;
        IsolatedUidChanged isolated_uid_changed = 43;
        // TODO: Reorder the numbering so that the most frequent occur events occur in the first 15.
    }

    // Pulled events will start at field 1000.
    oneof pulled {
        WifiBytesTransferred wifi_bytes_transferred = 1000;
        WifiBytesTransferredByFgBg wifi_bytes_transferred_by_fg_bg = 1001;
        MobileBytesTransferred mobile_bytes_transferred = 1002;
        MobileBytesTransferredByFgBg mobile_bytes_transferred_by_fg_bg = 1003;
        KernelWakelockPulled kernel_wakelock_pulled = 1004;
        PowerStatePlatformSleepStatePulled power_state_platform_sleep_state_pulled = 1005;
        PowerStateVoterPulled power_state_voter_pulled = 1006;
        PowerStateSubsystemSleepStatePulled power_state_subsystem_sleep_state_pulled = 1007;
        CpuTimePerFreqPulled cpu_time_per_freq_pulled = 1008;
    }
}

/**
 * A WorkSource represents the chained attribution of applications that
 * resulted in a particular bit of work being done.
 */
message WorkSource {
    // TODO
}

/*
 * *****************************************************************************
 * Below are all of the individual atoms that are logged by Android via statsd
 * and Westworld.
 *
 * RULES:
 *   - The field ids for each atom must start at 1, and count upwards by 1.
 *     Skipping field ids is not allowed.
 *   - These form an API, so renaming, renumbering or removing fields is
 *     not allowed between android releases.  (This is not currently enforced,
 *     but there will be a tool to enforce this restriction).
 *   - The types must be built-in protocol buffer types, namely, no sub-messages
 *     are allowed (yet).  The bytes type is also not allowed.
 *   - The CamelCase name of the message type should match the
 *     underscore_separated name as defined in StatsEvent.
 *   - If an atom represents work that can be attributed to an app, there can
 *     be exactly one WorkSource field. It must be field number 1.
 *   - A field that is a uid should be a string field, tagged with the [xxx]
 *     annotation. The generated code on android will be represented by UIDs,
 *     and those UIDs will be translated in xxx to those strings.
 *
 * CONVENTIONS:
 *   - Events are past tense. e.g. ScreenStateChanged, not ScreenStateChange.
 *   - If there is a UID, it goes first. Think in an object-oriented fashion.
 * *****************************************************************************
 */

/**
 * Logs when the screen state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ScreenStateChanged {
    // TODO: Use the real screen state.
    enum State {
        STATE_UNKNOWN = 0;
        STATE_OFF = 1;
        STATE_ON = 2;
        STATE_DOZE = 3;
        STATE_DOZE_SUSPEND = 4;
        STATE_VR = 5;
    }
    // New screen state.
    optional State display_state = 1;
}

/**
 * Logs that the state of a process state, as per the activity manager, has changed.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message UidProcessStateChanged {
    optional int32 uid = 1; // TODO: should be a string tagged w/ uid annotation

    // The state.
    // TODO: Use the real (mapped) process states.
    optional int32 state = 2;
}

/**
 * Logs that a process started, finished, crashed, or ANRed.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ProcessLifeCycleStateChanged {
    // TODO: Use the real (mapped) process states.
    optional int32 uid = 1; // TODO: should be a string tagged w/ uid annotation

    // TODO: What is this?
    optional string name = 2;

    // The state.
    // TODO: Use an enum.
    optional int32 event = 3;
}



/**
 * Logs when the ble scan state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message BleScanStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs when an unoptimized ble scan state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
// TODO: Consider changing to tracking per-scanner-id (log from AppScanStats).
message BleUnoptimizedScanStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs reporting of a ble scan finding results.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
// TODO: Consider changing to tracking per-scanner-id (log from AppScanStats).
message BleScanResultReceived {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    // Number of ble scan results returned.
    optional int32 num_of_results = 2;
}

/**
 * Logs when a sensor state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message SensorStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    // TODO: Is there a way to get the actual name of the sensor?
    // The id (int) of the sensor.
    optional int32 sensor_id = 2;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 3;
}


/**
 * Logs when GPS state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message GpsScanStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}


/**
 * Logs when a sync manager sync state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message SyncStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    // Name of the sync (as named in the app)
    optional string name = 2;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 3;
}

/**
 * Logs when a job scheduler job state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message ScheduledJobStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    // Name of the job (as named in the app)
    optional string name = 2;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 3;

    // TODO: Consider adding the stopReason (int)
}

/**
 * Logs when the audio state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message AudioStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs when the video codec state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message MediaCodecActivityChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs when the flashlight state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message FlashlightStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs when the camera state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message CameraStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs that the state of a wakelock (per app and per wakelock name) has changed.
 *
 * Logged from:
 *   TODO
 */
message WakelockStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    // Type of wakelock.
    enum Type {
        PARTIAL = 0;
        FULL = 1;
        WINDOW = 2;
    }
    optional int32 type = 2;

    // The wakelock tag (Called tag in the Java API, sometimes name elsewhere).
    optional string tag = 3;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 4;
}

/**
 * Logs when an app is holding a wakelock, regardless of the wakelock's name.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message UidWakelockStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    // Type of wakelock.
    enum Type {
        PARTIAL = 0;
        FULL = 1;
        WINDOW = 2;
    }
    optional int32 type = 2;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 3;
}

/**
 * Logs when a partial wakelock is considered 'long' (over 1 min).
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message LongPartialWakelockStateChanged {
    // TODO: Add attribution instead of uid?
    optional int32 uid = 1;

    // The wakelock tag (Called tag in the Java API, sometimes name elsewhere).
    optional string tag = 2;

    // TODO: I have no idea what this is.
    optional string history_tag = 3;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 4;
}

/**
 * Logs Battery Saver state change.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message BatterySaverModeStateChanged {
    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 1;
}

/**
 * Logs Doze mode state change.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message DeviceIdleModeStateChanged {
    // TODO: Use the enum matching BatteryStats.DEVICE_IDLE_MODE_.
    optional int32 state = 1;
}

/**
 * Logs screen brightness level.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ScreenBrightnessChanged {
    // Screen brightness level. Should be in [-1, 255] according to PowerManager.java.
    optional int32 level = 1;
}

/**
 * Logs battery level (percent full, from 0 to 100).
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message BatteryLevelChanged {
    // Battery level. Should be in [0, 100].
    optional int32 battery_level = 1;
}

/**
 * Logs change in charging status of the device.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message ChargingStateChanged {
    // TODO: Link directly to BatteryManager.java's constants (via a proto).
    enum State {
        BATTERY_STATUS_UNKNOWN = 1;
        BATTERY_STATUS_CHARGING = 2;
        BATTERY_STATUS_DISCHARGING = 3;
        BATTERY_STATUS_NOT_CHARGING = 4;
        BATTERY_STATUS_FULL = 5;
    }
    optional State charging_state = 1;
}

/**
 * Logs whether the device is plugged in, and what power source it is using.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message PluggedStateChanged {
    // TODO: Link directly to BatteryManager.java's constants (via a proto).
    enum State {
        // Note that NONE is not in BatteryManager.java's constants.
        BATTERY_PLUGGED_NONE = 0;
        // Power source is an AC charger.
        BATTERY_PLUGGED_AC = 1;
        // Power source is a USB port.
        BATTERY_PLUGGED_USB = 2;
        // Power source is wireless.
        BATTERY_PLUGGED_WIRELESS = 4;
    }
    optional State plugged_state = 1;
}

/**
 * Logs the temperature of the device, in tenths of a degree Celsius.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message DeviceTemperatureReported {
    // Temperature in tenths of a degree C.
    optional int32 temperature = 1;
}

// TODO: Define this more precisely.
// TODO: Log the ON state somewhere. It isn't currently logged anywhere.
/**
 * Logs when the device turns off or on.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message DeviceOnStatusChanged {
    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 1;
}

/**
 * Logs when an app's wakeup alarm fires.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message WakeupAlarmOccurred {
    // TODO: Add attribution instead of uid?
    optional int32 uid = 1;
}

/**
 * Logs kernel wakeup reasons and aborts.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message KernelWakeupReported {
    // Name of the kernel wakeup reason (or abort).
    optional string wakeup_reason_name = 1;

    // Duration (in microseconds) for the wake-up interrupt to be serviced.
    optional int64 duration_usec = 2;
}

/**
 * Logs wifi locks held by an app.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiLockStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs wifi signal strength changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiSignalStrengthChanged {
    // TODO: Reference the actual telephony/java/android/telephony/SignalStrength.java states.
    enum SignalStrength {
        SIGNAL_STRENGTH_NONE_OR_UNKNOWN = 0;
        SIGNAL_STRENGTH_POOR = 1;
        SIGNAL_STRENGTH_MODERATE = 2;
        SIGNAL_STRENGTH_GOOD = 3;
        SIGNAL_STRENGTH_GREAT = 4;
    }
    optional SignalStrength signal_strength = 1;
}

/**
 * Logs wifi scans performed by an app.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiScanStateChanged {
    // TODO: Add attribution instead of uid.
    optional int32 uid = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs phone signal strength changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message PhoneSignalStrengthChanged {
    // TODO: Reference the actual telephony/java/android/telephony/SignalStrength.java states.
    enum SignalStrength {
        SIGNAL_STRENGTH_NONE_OR_UNKNOWN = 0;
        SIGNAL_STRENGTH_POOR = 1;
        SIGNAL_STRENGTH_MODERATE = 2;
        SIGNAL_STRENGTH_GOOD = 3;
        SIGNAL_STRENGTH_GREAT = 4;
    }
    optional SignalStrength signal_strength = 1;
}

/**
 * Logs that a setting was updated.
 * Logged from:
 *   frameworks/base/core/java/android/provider/Settings.java
 * The tag and is_default allow resetting of settings to default values based on the specified
 * tag. See Settings#putString(ContentResolver, String, String, String, boolean) for more details.
 */
message SettingChanged {
    // The name of the setting.
    optional string setting = 1;

    // The change being imposed on this setting. May represent a number, eg "3".
    optional string value = 2;

    // The new value of this setting. For most settings, this is same as value. For some settings,
    // value is +X or -X where X represents an element in a set. For example, if the previous value
    // is A,B,C and value is -B, then new_value is A,C and prev_value is A,B,C.
    // The +/- feature is currently only used for location_providers_allowed.
    optional string new_value = 3;

    // The previous value of this setting.
    optional string prev_value = 4;

    // The tag used with the is_default for resetting sets of settings. This is generally null.
    optional string tag = 5;

    // 1 indicates that this setting with tag should be resettable.
    optional int32 is_default = 6;

    // The user ID associated. Defined in android/os/UserHandle.java
    optional int32 user = 7;
}

/*
 * Logs activity going to foreground or background
 *
 * Logged from:
  *   frameworks/base/services/core/java/com/android/server/am/ActivityRecord.java
 */
message ActivityForegroundStateChanged {
    enum Activity {
        MOVE_TO_BACKGROUND = 0;
        MOVE_TO_FOREGROUND = 1;
    }
    optional int32 uid = 1;
    optional string pkg_name = 2;
    optional string class_name = 3;
    optional Activity activity = 4;
}

/**
 * Pulls bytes transferred via wifi (Sum of foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are wifi)
 */
message WifiBytesTransferred {
    optional int32 uid = 1;

    optional int64 rx_bytes = 2;

    optional int64 rx_packets = 3;

    optional int64 tx_bytes = 4;

    optional int64 tx_packets = 5;
}

/**
 * Pulls bytes transferred via wifi (separated by foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are wifi)
 */
message WifiBytesTransferredByFgBg {
    optional int32 uid = 1;

    // 1 denotes foreground and 0 denotes background. This is called Set in NetworkStats.
    optional int32 is_foreground = 2;

    optional int64 rx_bytes = 3;

    optional int64 rx_packets = 4;

    optional int64 tx_bytes = 5;

    optional int64 tx_packets = 6;
}

/**
 * Pulls bytes transferred via mobile networks (Sum of foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are mobile data)
 */
message MobileBytesTransferred {
    optional int32 uid = 1;

    optional int64 rx_bytes = 2;

    optional int64 rx_packets = 3;

    optional int64 tx_bytes = 4;

    optional int64 tx_packets = 5;
}

/**
 * Pulls bytes transferred via mobile networks (separated by foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are mobile data)
 */
message MobileBytesTransferredByFgBg {
    optional int32 uid = 1;

    // 1 denotes foreground and 0 denotes background. This is called Set in NetworkStats.
    optional int32 is_foreground = 2;

    optional int64 rx_bytes = 3;

    optional int64 rx_packets = 4;

    optional int64 tx_bytes = 5;

    optional int64 tx_packets = 6;
}

/**
 * Pulls the kernel wakelock durations. This atom is adapted from
 * android/internal/os/KernelWakelockStats.java
 *
 * Pulled from:
 *   StatsCompanionService using KernelWakelockReader.
 */
message KernelWakelockPulled {
    optional string name = 1;

    optional int32 count = 2;

    optional int32 version = 3;

    optional int64 time = 4;
}

/*
 * Pulls PowerStatePlatformSleepState.
 *
 * Definition here:
 *   hardware/interfaces/power/1.0/types.hal
 */
message PowerStatePlatformSleepStatePulled {
    optional string name = 1;
    optional uint64 residency_in_msec_since_boot = 2;
    optional uint64 total_transitions = 3;
    optional bool supported_only_in_suspend = 4;
}

/**
 * Pulls PowerStateVoter.
 *
 * Definition here:
 *   hardware/interfaces/power/1.0/types.hal
 */
message PowerStateVoterPulled {
    optional string power_state_platform_sleep_state_name = 1;
    optional string power_state_voter_name = 2;
    optional uint64 total_time_in_msec_voted_for_since_boot = 3;
    optional uint64 total_number_of_times_voted_since_boot = 4;
}

/**
 * Pulls PowerStateSubsystemSleepState.
 *
 * Definition here:
 *   hardware/interfaces/power/1.1/types.hal
 */
message PowerStateSubsystemSleepStatePulled {
    optional string power_state_subsystem_name = 1;
    optional string power_state_subsystem_sleep_state_name = 2;
    optional uint64 residency_in_msec_since_boot = 3;
    optional uint64 total_transitions = 4;
    optional uint64 last_entry_timestamp_ms = 5;
    optional bool supported_only_in_suspend = 6;
}

/**
<<<<<<< HEAD
 * Logs creation or removal of an isolated uid. Isolated uid's are temporary uid's to sandbox risky
 * behavior in its own uid. However, the metrics of these isolated uid's almost always should be
 * attributed back to the parent (host) uid. One example is Chrome.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message IsolatedUidChanged {
    // The host UID. Generally, we should attribute metrics from the isolated uid to the host uid.
    optional int32 parent_uid = 1;

    optional int32 isolated_uid = 2;

    // 1 denotes we're creating an isolated uid and 0 denotes removal. We expect an isolated uid to
    // be removed before if it's used for another parent uid.
    optional int32 is_create = 3;
}

/*
 * Pulls Cpu time per frequency.
 * Note: this should be pulled for gauge metric only, without condition.
 * The puller keeps internal state of last values. It should not be pulled by
 * different metrics.
 * The pulled data is delta of cpu time from last pull, calculated as
 * following:
 * if current time is larger than last value, take delta between the two.
 * if current time is smaller than last value, there must be a cpu
 * hotplug event, and the current time is taken as delta.
 */
message CpuTimePerFreqPulled {
    optional uint32 cluster = 1;
    optional uint32 freq_index = 2;
    optional uint64 time = 3;
}